Are you using QlikSense server or Desktop Edition?
QS server comes with QMC (Management Console) which allows easy extensions' import..
Just browse to the ZIP file you've downloaded and the system will extract data from the ZIP file and will copy all necessary files to proper folder on your system.
Desktop version requires some manual copying, but it's just extracting the content of your ZIP file to the local folder.
Hello - thanks for your question.
In addition you may want to check out this video:
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